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Old Jun 05, 2004, 11:53 PM
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Joined Apr 2000
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using a motor as a servo?

anyone know how (assuming it's possible) to turn a continuous turning motor into a servo or give it "servo-like" control? basically i have a motor i can control remotely to go full on, off, or reverse. i want to be able to use this to move a control surface
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Old Jun 06, 2004, 02:56 AM
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N. Staffs, UK
Joined Jan 1997
5,654 Posts

Starting from just a motor will need a lot of extras. You need something to sense the servo position and feedback control electronics to drive the motor to the correct position.

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Old Jun 06, 2004, 11:28 AM
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Palmdale, CA
Joined Oct 2000
13,551 Posts
You add a gear train to a motor to slow the motor's many revolutions down to the 1 or less at the output.
I have used slot car gears to do this.
The selection of direction and amount is as simple as an On-off-on switch, or a feedback system that controls the position.
There's two hard parts. Aligning the gear train, and creating the feedback loop.
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Old Jul 09, 2004, 03:58 AM
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United Kingdom, Norwich
Joined Jun 2004
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You could just use the motor to turn a length of threaded rod with a free running nut connected to your control surface (screw jack) and ideally use limit (micro)switches to stop where you desire. Your 'start' switch would then short out the appropriate limit switch to get things moving in the right need for feedback electronics then.
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Old Jul 16, 2004, 11:13 AM
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Crawley, West Sussex, UK
Joined Jun 2004
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You should be able to take the circuit board out of a servo, use the motor wires to drive your motor (possibly with something to increase the power) and use the pot (or a similar one) to sense the position.

I say 'should' because changing the motor doesn't always work, but I don't know much about electronics! You can certainly remove the pot from a servo and attach it to something else.
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